| Summary: | Herein, a three-dimensional (3D) Fe<sub>3</sub>O<sub>4</sub>@C composite with hollow porous structure is prepared by simple solution method and calcination treatment with biomass waste rape pollen (RP) as a carbon source, which is served as an anode of Li-ion capacitor (LIC). The 3D interconnected porous structure and conductive networks facilitate the transfer of ion/electron and accommodate the volume changes of Fe<sub>3</sub>O<sub>4</sub> during the electrochemical reaction process, which leads to the excellent performance of the Fe<sub>3</sub>O<sub>4</sub>@C composite electrode. The electrochemical analysis demonstrates that the hybrid LIC fabricated with Fe<sub>3</sub>O<sub>4</sub>@C as the anode and activated carbon (AC) as the cathode can operate at a voltage of 4.0 V and exhibit a high energy density of 140.6 Wh kg<sup>−1</sup> at 200 W kg<sup>−1</sup> (52.8 Wh kg<sup>−1</sup> at 10 kW kg<sup>−1</sup>), along with excellent cycling stability, with a capacity retention of 83.3% over 6000 cycles. Hence, these encouraging results indicate that Fe<sub>3</sub>O<sub>4</sub>@C has great potential in developing advanced LICs electrode materials for the next generation of energy storage systems.
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